如何從DATABSE獲得兩個字段的總和

Question

$query = "SELECT agent_id, SUM(amount) FROM bill WHERE YEAR(date) = YEAR(CURDATE()) AND MONTH(date) = MONTH(CURDATE()) GROUP BY agent_id"; 

$result = mysql_query($query) or die(mysql_error()); 

// Print out result 
while($row = mysql_fetch_array($result)){ 
    echo "Total ". $row['agent_id']. " = $". $row['SUM(amount)']; 
    echo "<br />"; 
} 

DB結構圖像：

我想知道它是如何可以顯示支票金額和數量目前其工作的量的總和只有

Answer 1

當然可以，您的查詢只是看起來像這樣：

SELECT agent_id, SUM(amount + cheque) 
FROM bill 
WHERE YEAR(date) = YEAR(CURDATE()) 
AND MONTH(date) = MONTH(CURDATE()) 
GROUP BY agent_id 

Answer 2

只是試試這個（我從你的問題理解） -

SELECT agent_id, (SUM(amount)+sum(cheque)) As total FROM bill WHERE YEAR(date) = YEAR(CURDATE()) AND MONTH(date) = MONTH(CURDATE()) GROUP BY agent_id"; 

Answer 3

SELECT agent_id, (SUM(amount) + SUM(cheque)) AS total_amount 
FROM bill WHERE YEAR(date) = YEAR(CURDATE()) AND MONTH(date) = MONTH(CURDATE()) 
GROUP BY agent_id